androidsqldatabasesqliteopenhelper
How to update list item in sql?
This is my list activity:
public class List extends ActionBarActivity{
private CustomCursorAdapter customAdapter;
private PersonDatabaseHelper databaseHelper;
private static final int ENTER_DATA_REQUEST_CODE = 1;
private ListView listView;
private static final String TAG = List.class.getSimpleName();
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listview);
databaseHelper = new PersonDatabaseHelper(this);
listView = (ListView) findViewById(R.id.list_data);
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Log.d(TAG, "clicked on item: " + position);
Intent intent = new Intent(List.this, Edit.class);
Person p = new Person();
Cursor cursor = (Cursor) customAdapter.getItem(position);
p.name = cursor.getString(cursor.getColumnIndex("person_name"));
p.surname = cursor.getString(cursor.getColumnIndex("person_surname"));
p.enterDate = cursor.getString(cursor.getColumnIndex("person_enterdate"));
p.enterTime = cursor.getString(cursor.getColumnIndex("person_entertime"));
p.exitDate = cursor.getString(cursor.getColumnIndex("person_exitdate"));
p.exitTime = cursor.getString(cursor.getColumnIndex("person_exittime"));
intent.putExtra("id", position);
intent.putExtra("name",p.name);
intent.putExtra("surname",p.surname );
intent.putExtra("enterdate",p.enterDate );
intent.putExtra("entertime",p.enterTime);
intent.putExtra("exitdate", p.exitDate);
intent.putExtra("exittime", p.exitTime);
startActivity(intent);
}
});
listView.setOnLongClickListener(new OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
return false;
// TODO Auto-generated method stub
}
});
// Database query can be a time consuming task ..
// so its safe to call database query in another thread
// Handler, will handle this stuff for you <img src="http://s0.wp.com/wp-includes/images/smilies/icon_smile.gif?m=1129645325g" alt=":)" class="wp-smiley">
new Handler().post(new Runnable() {
@Override
public void run() {
customAdapter = new CustomCursorAdapter(List.this, databaseHelper.getAllData());
listView.setAdapter(customAdapter);
}
});
}
public void onClickEnterData(View btnAdd) {
startActivityForResult(new Intent(this, Permission.class), ENTER_DATA_REQUEST_CODE);
}
public void onClickLogOut(View btnLogOut){
Intent intent = new Intent(List.this,
MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
databaseHelper.insertData(data.getExtras().getString("tag_person_name"), data.getExtras().getString("tag_person_surname"),data.getExtras().getString("tag_person_enterdate"),data.getExtras().getString("tag_person_entertime"),data.getExtras().getString("tag_person_exitdate"),data.getExtras().getString("tag_person_exittime"));
customAdapter.changeCursor(databaseHelper.getAllData());
}
}
This is my Edit activity then i press on list view item :
public class Edit extends ActionBarActivity {
EditText name;
EditText surName;
EditText date;
EditText time;
EditText eDate;
EditText eTime;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_edit);
Intent intent = getIntent();
String data_name = intent.getStringExtra("name");
String data_surname = intent.getStringExtra("surname");
String data_enterdate= intent.getStringExtra("enterdate");
String data_entertime = intent.getStringExtra("entertime");
String data_exitdate = intent.getStringExtra("exitdate");
String data_exittime = intent.getStringExtra("exittime"); //typo here
name = (EditText) findViewById(R.id.username); //corrected
surName = (EditText) findViewById(R.id.usersurname); //corrected
date = (EditText) findViewById(R.id.date2);
time = (EditText) findViewById(R.id.time2);
eDate = (EditText) findViewById(R.id.date3);
eTime = (EditText) findViewById(R.id.time3);
name.setText(data_name);
surName.setText(data_surname);
date.setText(data_enterdate);
time.setText(data_entertime);
eDate.setText(data_exitdate);
eTime.setText(data_exittime);
}
public void onCancel(View btnCancel){
finish();
}
public void onClickSave(View btnSave){
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.edit, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
So in this Edit activity is defined button public onClickSave(View btnSave), i want to make a database upgrade after i press this button, after a lot of tries, i managed to upgrade database but it wont update clciked item in the list, it just creates a new (one more item) in the list. So i am starting from the beginning again :( .
This is my DatabaseHelper:
public class PersonDatabaseHelper {
private static final String TAG = PersonDatabaseHelper.class.getSimpleName();
// database configuration
// if you want the onUpgrade to run then change the database_version
private static final int DATABASE_VERSION = 7;
private static final String DATABASE_NAME = "database.db";
// table configuration
static final String TABLE_NAME = "person_table"; // Table name
static final String PERSON_TABLE_COLUMN_ID = "_id"; // a column named "_id" is required for cursor
static final String PERSON_TABLE_COLUMN_NAME = "person_name";
static final String PERSON_TABLE_COLUMN_SURNAME = "person_surname";
static final String PERSON_TABLE_COLUMN_ENTERDATE = "person_enterdate";
static final String PERSON_TABLE_COLUMN_ENTERTIME = "person_entertime";
static final String PERSON_TABLE_COLUMN_EXITDATE = "person_exitdate";
static final String PERSON_TABLE_COLUMN_EXITTIME = "person_exittime";
private DatabaseOpenHelper openHelper;
private SQLiteDatabase database;
// this is a wrapper class. that means, from outside world, anyone will communicate with PersonDatabaseHelper,
// but under the hood actually DatabaseOpenHelper class will perform database CRUD operations
public PersonDatabaseHelper(Context aContext) {
openHelper = new DatabaseOpenHelper(aContext);
database = openHelper.getWritableDatabase();
}
public void insertData (String aPersonName, String aPersonSurName, String aPersonEnterDate,String aPersonEnterTime, String aPersonExitDate,String aPersonExitTime) {
// we are using ContentValues to avoid sql format errors
ContentValues contentValues = new ContentValues();
contentValues.put(PERSON_TABLE_COLUMN_NAME, aPersonName);
contentValues.put(PERSON_TABLE_COLUMN_SURNAME, aPersonSurName);
contentValues.put(PERSON_TABLE_COLUMN_ENTERDATE, aPersonEnterDate);
contentValues.put(PERSON_TABLE_COLUMN_ENTERTIME, aPersonEnterTime);
contentValues.put(PERSON_TABLE_COLUMN_EXITDATE, aPersonExitDate);
contentValues.put(PERSON_TABLE_COLUMN_EXITTIME, aPersonExitTime);
database.insert(TABLE_NAME, null, contentValues);
}
public Cursor getAllData () {
String buildSQL = "SELECT * FROM " + TABLE_NAME;
Log.d(TAG, "getAllData SQL: " + buildSQL);
return database.rawQuery(buildSQL, null);
}
// this DatabaseOpenHelper class will actually be used to perform database related operation
private class DatabaseOpenHelper extends SQLiteOpenHelper {
public DatabaseOpenHelper(Context aContext) {
super(aContext, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
// Create your tables here
String buildSQL = "CREATE TABLE " + TABLE_NAME + "( " + PERSON_TABLE_COLUMN_ID + " INTEGER PRIMARY KEY, " +
PERSON_TABLE_COLUMN_NAME + " TEXT, " + PERSON_TABLE_COLUMN_SURNAME + " TEXT, " + PERSON_TABLE_COLUMN_ENTERDATE + " TEXT," + PERSON_TABLE_COLUMN_ENTERTIME + " TEXT," + PERSON_TABLE_COLUMN_EXITDATE + " TEXT," + PERSON_TABLE_COLUMN_EXITTIME + " TEXT )";
Log.d(TAG, "onCreate SQL: " + buildSQL);
sqLiteDatabase.execSQL(buildSQL);
}
@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int oldVersion, int newVersion) {
// Database schema upgrade code goes here
String buildSQL = "DROP TABLE IF EXISTS " + TABLE_NAME;
Log.d(TAG, "onUpgrade SQL: " + buildSQL);
sqLiteDatabase.execSQL(buildSQL); // drop previous table
onCreate(sqLiteDatabase); // create the table from the beginning
}
}
}
This is my custom cursor:
public class CustomCursorAdapter extends CursorAdapter {
@SuppressWarnings("deprecation")
public CustomCursorAdapter(Context context, Cursor c) {
super(context, c);
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
// when the view will be created for first time,
// we need to tell the adapters, how each item will look
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View retView = inflater.inflate(R.layout.single_row_item, parent, false);
return retView;
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
// here we are setting our data
// that means, take the data from the cursor and put it in views
TextView textViewPersonName = (TextView) view.findViewById(R.id.name);
textViewPersonName.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(1))));
TextView textViewPersonsurName = (TextView) view.findViewById(R.id.surName);
textViewPersonsurName.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(2))));
TextView textViewPersonEnterDate = (TextView) view.findViewById(R.id.date);
textViewPersonEnterDate.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(3))));
TextView textViewPersonEnterTime = (TextView) view.findViewById(R.id.time);
textViewPersonEnterTime.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(4))));
TextView textViewPersonExitDate = (TextView) view.findViewById(R.id.date2);
textViewPersonExitDate.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(5))));
TextView textViewPersonExitTime = (TextView) view.findViewById(R.id.time2);
textViewPersonExitTime.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(6))));
}
}
And person class :
public class Person {
String name;
String surname;
String enterDate;
String enterTime;
String exitDate;
String exitTime;
}
This is my list
This is Edit activity then i press on item :
So and there u can see my add button which updates info.
Solution
Read carefully this tutorial. In particular, take a look at section 9, where you can find info about ContentProviders, Loaders and CursorAdapter. The example shows how to use a SimpleCursorAdapter, you can slightly modify it to use a CursorAdapter; in any case, if you follow that tutorial you have a very clean code and a database that notifies automatically your UI when a INSERT, UPDATE or DELETE is performed against the database.